You could group them and look at everything “outdoors” related from multiple communities in a single feed.
I hope that with future versions of lemmy they can create “lists” that people can subscribe to that will do this.
or at least let you add communities to your own lists that do that.
This is exciting. I loved sync for reddit and I look forward to more app options. Jerboa is good, but competition is better.
If you can wait a bit you can get sync for lemmy.